Physical Therapy Assistant Practice Exam 2026 - Free PTA Practice Questions and Study Guide

To determine the appropriate amount to subtract from the back height measurement for fitting below the inferior angles of the scapulae, it's important to understand the typical anatomical location of these structures. The inferior angles of the scapulae are generally situated about four inches below the overall back height measurement of an individual when in a standing position. This four-inch adjustment allows for adequate clearance and comfort when sitting, ensuring that the backrest of a chair or wheelchair does not interfere with the movement and positioning of the shoulder blades.

This standard practice is particularly important in contexts such as wheelchair fitting, where achieving proper posture and avoiding pressure points enhances comfort and function for the user. Therefore, a subtraction of four inches from the back height measurement is considered best practice for fitting below the inferior angles of the scapulae.